During 1972 in Idaho, America, the Broberg family became friendly with their neighbour Robert 'B' Berchtold.

Over two years Berchtold manipulated the family and gained their trust so that he could put his plan of abducting and abusing their 12-year-old daughter into action.

The Netflix documentary has been described as 'jaw dropping'. (Credit: Netflix)

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During his manipulation, Berchtold became extremely close with the family and groomed the parents as well as their daughter.

Berchtold had an affair with both of Jan's parents, however, not at the same time. In the documentary Jan's mum says: "He gave me a great feeling about myself. I was attracted to him."

During the documentary, Jan's father is obviously extremely distressed about the sexual engagements he had with his daughter's kidnapper.

In the lead up to Berchtold's first abduction of Jan, he convinced her parents to let him sleep in her bed as part of therapy he was receiving after suffering from abuse as a child.

Berchtold spent two years manipulating the family. (Credit: Netflix)

On 17th October 1974, Berchtold abducted Jan for the first time. In an interview on Dr Phil, Jan revealed that she was told she was going horse riding so was given an 'allergy pill'.

She then explained how she woke up in Mexico: "He handed me my allergy pill because I was going to be around horses. After I took the pill, I woke up in the back of a moving motor home and my arms and my legs were strapped to the back of the bed.

"I was drugged. I was in and out of very, very deep sleep. For the next five weeks I was missing. This is when the sexual abuse began."

Berchtold had Jan believing she was an alien, and that she needed to conceive a child with him by her 16th birthday to save the residents of her home planet.

After the release of the book, Berchtold denied all claims and told ABC News: "They're trying to make a buck.

Berchtold denied all claims. (Credit: Netflix)

"My mom got sick when I was a teenager and I had to take care of my little sister. I was very happy at the time, because my stepfather finally liked me and everything was good. Later, I had reverted back to taking care of a little girl."

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Before denying the claim, Berchtold turned up at a talk in Utah where Jan was the keynote speaker, breaking the conditions of his restraining order.

He reportedly showed up at the event and threatened a volunteer from Bikers Against Child Abuse with a handgun before driving his van into the volunteer and fleeing the scene.